Ive been having this problem since before the 2.1 update. A few weeks ago I setup my yahoo account using the stock email apparently. It worked for about a week then started to force close. Weird thing is I was still getting my mail through but after 10 sec.or so of having it open it would force close. I thought the update was supposed to fix it. But its still doing it. I tried deleting my account and reentering my info and this didn't work either. The only other problem I had with the update was with the gallery icon. When I clicked on my icon it said it wasent installed. I pulled up the menu and there ad the gallery saved it as short cut deleted the old icon and its now working great.